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[问答]

LIS3DH自我测试得到大约数据表中指示值的一半的值

亲爱的大家,

我正在研究LIS3DH并尝试正确开发嵌入式自测功能。

我所做的只是评估“正常测量”和“自测量测量”之间的差异,并检查这些差异是否与数据表第10页中声明的自测输出变化相匹配。

问题是(@ 3V电源)我总是得到大约数据表中指示值的一半的值。

我还在网上找到了这个自我测试程序:
http://www.edn.com/design/analog ... MS-inertial-sensors

并且它强调测量的差异应介于两者之间,但我无法在数据表中找到SELF TEST OUTPUT CHANGE的MIN / MAX值。

考虑到它还取决于电源,我如何评估我的应用工作在3.6V和2.5V之间的MIN / MAX值?

等你回复,

最好的祝福,
克劳迪奥
#lis3dh自检

以上来自于谷歌翻译


以下为原文




Dear all,

I am working on the LIS3DH and trying to correctly develop the embedded Self Test feature.

All I do is evaluating the difference between the ''Normal Measurements'' and the ''Self Test Measurements'' and check if these differences match with the Self Test Output Change declared at page 10 in the Data Sheet.

The problem is that (@3V supply) I always get values about one half the ones indicated in the data sheet.  

I also found this Self Test Procedure on the web:
http://www.edn.com/design/analog ... MS-inertial-sensors

and it underlines that the measured difference should fall between  but I cannot find on the Data Sheet the MIN/MAX values for the SELF TEST OUTPUT CHANGE.

Considering that it also depends on the power supply, how can I evaluate this MIN/MAX value for my application working between 3.6V and 2.5V??

Waiting for you reply,

Best regards,
Claudio  
#lis3dh-self-test

回帖(2)

张鑫

2018-11-6 10:39:49
你好Claudio,
 
 
 LIS3DH加速度计自检最小/最大值为:min_x = min_y = min_z = 60mg,max_x = max_y = max_z = 1700mg。在+/- 2g FS时,这意味着最小值为60LSBs,最大值为1700LSB,因为灵敏度为1mg / LSB。
 该最小/最大范围涵盖1.71V至3.6V的所有Vdd,所有FS范围和所有ODR。如果这是您正在寻找的信息,请告诉我。
 
 谢谢,
 
 蒂亚戈雷斯

以上来自于谷歌翻译


以下为原文







Hello Claudio,

  
LIS3DH accelerometer self-test min/max values are: min_x = min_y = min_z = 60mg and max_x = max_y = max_z = 1700mg. At +/-2g FS, this translates to 60LSBs min and 1700LSBs max values because the sensitivity is 1mg/LSB.  
This min/max range covers all Vdd from 1.71V to 3.6V, all FS ranges and all ODRs. Please let me know if this was the information that you were looking for.

Thank you,

Thiago Reis
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李艳

2018-11-6 10:53:43
你好Thiago,
 
 我不明白你的答案=>在数据表中,X和Y写入276 LSb,Z轴写入984 LSb。你如何证明你的答案?
 最好的祝福。密歇根州。

以上来自于谷歌翻译


以下为原文





Hello Thiago,

I do not understand your answer => in the datasheet it is written 276 LSb for X and Y, and 984 LSb for Z axis. How do you justify your answer?
Best Regards. Mich.
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